Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part4 : 1 to 5
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
1.Which is false statement about normalising. Normalising is done to |
| refine grain structure |
| reduce segregation in casting |
| improve mechanical properties |
| induce stresses- |
| relieve internal stresses. |
2.Argentite is the principal ore or raw material for |
| aluminium |
| tin |
| zinc |
| lead |
| silver. |
3.Chromium in steel |
| improves wear resistance, cutting ability and toughness |
| refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties |
| improves cutting ability and reduces hardenability |
| gives ductility, toughness, tensile strength and anticorrosion properties |
| makes steel hard. |
4.Which is false statement about tempering. Tempering is done to |
| improve machinability |
| improve ductility |
| improve toughness |
| release stresses |
| reduce hardness and brittleness. |
5.Hardness of upper bainite (acicular structure) is about |
| RC 65 |
| RC 48 |
| RC 57 |
| RC 80 |
| RC 32. |
More Engineering Materials QUESTIONS AND ANSWERS available in next pages
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